CN102158902A - Event trigger based load information reporting method in mobile load balance - Google Patents

Event trigger based load information reporting method in mobile load balance Download PDF

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CN102158902A
CN102158902A CN2011100405610A CN201110040561A CN102158902A CN 102158902 A CN102158902 A CN 102158902A CN 2011100405610 A CN2011100405610 A CN 2011100405610A CN 201110040561 A CN201110040561 A CN 201110040561A CN 102158902 A CN102158902 A CN 102158902A
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overload
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CN102158902B (en
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娄崇
晋英豪
邱玲
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University of Science and Technology of China USTC
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University of Science and Technology of China USTC
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Abstract

The invention discloses an event trigger based load information reporting method in mobile load balance among different access technologies. The load information reporting method is characterized in that a trigger threshold in a trigger condition of a low-trigger threshold event B is configured into an overload threshold through an operation, management and maintenance entity of a current cell, and a trigger threshold in a trigger condition of a high-trigger threshold event A is determined by the sum of the overload threshold and a slippage factor. Because the slippage factor is introduced in the trigger threshold, the method ensures that the event trigger threshold can be dynamically regulated according to an overload condition of a request cell and a load condition of a reporting cell, thereby improving property of the mobile load balancing, and reducing signaling overhead brought by load reporting information interaction in the network.

Description

In a kind of moving load equilibrium based on the load information method for reporting of Event triggered
Technical field
The invention belongs to the 4th advanced person's of third-generation mobile communication system Long Term Evolution (Long Term Evolution-Advanced, hereinafter to be referred as LTE-Advanced) in moving load equilibrium (Inter-RAT Mobility LoadBalancing between different access technologies, hereinafter to be referred as Inter-RAT MLB) technical field, particularly based on the load information method for reporting of Event triggered.
Background technology
Propose among " the vehicle-mounted technical conference of international electronics and The Institution of Electrical Engineers " (" On Mobility Load Balancing for LTESystems " in Vehicular Technology Conference.VTC 2010-Fall.IEEE), in the 4th third-generation mobile communication system, moving load equilibrium (MLB) is mainly by exchanging cell load information between the sub-district of different loads situation, the mode that employing is switched is transferred to low loaded cell with the fractional load of high capacity sub-district, reach the purpose of balance minizone load, and then improve wireless resource utility efficiency and optimize network performance.
The 69 meeting add-on conference (3GPPTSG-RAN WG3#69bis of third generation partner program wireless access network the 3rd working group, October, 2010) proposed first in a kind of between the different access technologies sub-district load information reporting mechanism based on Event triggered: at first, overloaded cells is initiated load to peripheral cell and is reported request, then, satisfying the sub-district of trigger conditions will ask the sub-district to report the load state information of self to this, and described trigger conditions can be expressed as follows:
The high threshold event A trigger condition that triggers: report cell uplink/descending disposable load ratio＞Th A, this Th ABe that height triggers threshold event A and triggers thresholding, and the duration of satisfying trigger condition is greater than the time lag factor; The low threshold event B trigger condition that triggers: report cell uplink/descending disposable load ratio＜Th B, this Th BBe that the low threshold event B that triggers triggers thresholding, and the duration of satisfying trigger condition is greater than the time lag factor;
Wherein triggering thresholding is configured by the Operations, Administration and Maintenance entity (OAM) of this sub-district.The load state of self was reported in this sub-district when high triggering threshold event A triggered, and represented that this cell load grade is for high; The load state of self was reported in this sub-district when low triggering threshold event B triggered, and it is low indicating this cell load grade.Because the Operations, Administration and Maintenance entity is difficult to reasonable configuration and triggers thresholding, if two are triggered thresholding at a distance of bigger, this mechanism will cause some sub-district that the part disposable load is arranged, but can't not report load state information owing to reach the triggering thresholding, thereby influence the effect of moving load equalization operation; If trigger thresholding at a distance of less, will cause more cell load information mutual in network, cause comparatively serious signaling consumption.
The 70 meeting (3GPP TSG-RANWG3#70 of third generation partner program wireless access network the 3rd working group, November, a kind of enhancing mechanism based on the Event triggered reporting mechanism has been proposed 2010), triggering thresholding in this mechanism can dynamically adjust according to the disposable load situation of request sub-district, and the sign that shifts as interrupt load with load state 0 in load information is reported.But because its setting that triggers thresholding does not consider that all the other report the load state in sub-districts, cause this mechanism to lack flexibility, and still exist the part sub-district that disposable load is arranged but do not reach the triggering thresholding of setting, and can't carry out the problem that load is reported.
Summary of the invention
The objective of the invention is to propose between a kind of different access technologies in the moving load equilibrium load information method for reporting based on Event triggered, to strengthen the flexibility of reporting mechanism, promote the performance of moving load equilibrium and lower the signaling consumption that brings alternately that load information is reported in the network.
In the moving load equilibrium of the present invention based on the load information method for reporting of Event triggered, comprise: each sub-district is provided with a base station in the mobile communication system of different access technologies, and the configuration height triggers threshold event A and the low trigger condition that triggers threshold event B in the load-balancing algorithm module of all base stations: when the sub-district is in overload conditions, this sub-district as the request sub-district, is initiated load according to neighbor cell lists by the sub-district of S1 interface in all tabulations and reported request; The sub-district of receiving the load request of reporting as reporting the sub-district, is reported to request sub-district feedback load information by the S1 interface;
It is characterized in that:
The low triggering thresholding Th that triggers threshold event B B=Th Overload, Th wherein OverloadBe overload threshold; The high triggering thresholding Th that triggers threshold event A A=Th Overload+ α, wherein α is a slippage factor;
The request sub-district is provided with slippage factor earlier:
If load balancing number of operations n=1, if request sub-district disposable load C 0Satisfy
1 2 &times; Th overload < C 0 &le; Th overload
The initial sliding factor then
Figure BDA0000047204740000022
Wherein α is the base station value of the slippage factor of preservation before, then current slippage factor α=α 0If request sub-district disposable load C 0Satisfy The initial sliding factor then
Figure BDA0000047204740000024
Wherein α is the base station value of the slippage factor of preservation before, then current slippage factor α=α 0
If disposable load C in the report of cell load message is reported if the request sub-district receives in load balancing number of operations n ≠ 1 k, k ∈ 1,2 ..., maximum disposable load satisfies among the K}
Figure BDA0000047204740000025
Wherein K is for reporting number of cells, and delta is the constant offset amount, and then slippage factor is updated to α=max (α-Δ, 0), and wherein Δ is the adjustment step-length of slippage factor α; If receiving, the request sub-district reports disposable load C in the cell load feedback message k, k ∈ 1,2 ..., maximum disposable load satisfies among the K}
Figure BDA0000047204740000026
Then slippage factor be updated to α=max (α+Δ, delta);
If slippage factor α 〉=α Max, α wherein MaxBe the slippage factor maximum, load balancing number of operations n is changed to 1, then reports flow process and finishes;
If slippage factor α＜α Max, the value of slippage factor α is preserved in the base station, and the request sub-district is initiated load according to neighbor cell lists by the sub-district of S1 interface in all tabulations and is reported request, and the value of carrying slippage factor α in request message;
Then, reporting sub-district feedback cell load information reports:
Satisfy highly when triggering threshold event A trigger condition if report the sub-district, this sub-district comprises the grade of load indication of this sub-district and the cell load condition information of the up/ratio of descending disposable load in cell capacity by the S1 interface to request sub-district feedback;
If report satisfied low triggering threshold event B trigger condition in sub-district and the high threshold event A that triggers when having triggered before, information is reported, the sign that shifts as interrupt load with load state 0 in this information by interface S1 to request sub-district feedback cell load in this sub-district;
Satisfy and lowly trigger threshold event B trigger condition but do not trigger the high threshold event A that triggers before if report the sub-district, then feedback message not;
Then, the moving load equalization operation is carried out in the request sub-district;
At last, step is detected in the request sub-district:
If the load balancing operation is finished, n is changed to 1 with the load balancing number of operations, reports flow process and finishes;
If load balancing operation disruption or failure then are changed to n=n+1 with load balancing number of operations n, slippage factor is reset in the request sub-district, carries out new round operation.
Compared with prior art, in the moving load equilibrium that the present invention proposes based on the load information method for reporting of Event triggered, because by in triggering thresholding, introducing slippage factor, make the sub-district that calls request dynamically to adjust the Event triggered thresholding according to the load state information of this cell-overload situation and all report sub-districts, thereby promoted the performance of moving load equilibrium, and lowered the signaling consumption that load report information interaction is brought in the network.
Description of drawings
Fig. 1 is based on the FB(flow block) of the load information method for reporting of Event triggered in the moving load equilibrium of the present invention.
Fig. 2 is load balancing operation for the first time among the embodiment 2, reports the load information feedback number of times of sub-district and the contrast histogram of other machine-processed load informations feedback number of times in the load information method for reporting of the present invention.
Fig. 3 is load balancing operation for the second time among the embodiment 2, reports the load information feedback number of times of sub-district and the contrast histogram of other machine-processed load informations feedback number of times in the load information method for reporting of the present invention.
Fig. 4 is twice load balancing operation among the embodiment 2, reports the load information feedback total degree of sub-district and the contrast histogram of other machine-processed load informations feedback total degree in the load information method for reporting of the present invention.
Embodiment
Embodiment below in conjunction with description of drawings this method.
Embodiment 1:
Present embodiment is the situation when being applied to adjacent sub-district heavy duty based on the load information method for reporting of Event triggered in the moving load equilibrium of the present invention, adopt 4 sub-districts, two kinds of access technologies, wherein sub-district a adopts access technology RAT-A, sub-district b, c and d adopt access technology RAT-B, sub-district a is as the request sub-district, sub-district b, c, d be as reporting the sub-district, and be kept at as neighbor cell in the middle of the adjacent cell list of sub-district a, and incident A had all been triggered in all sub-districts in three kinds of mechanism.
Fig. 1 has provided in the moving load equilibrium of the present invention FB(flow block) based on the load information method for reporting of Event triggered:
The beginning module I represents that load method for reporting of the present invention begins, at first ask sub-district judging module II to judge whether this operation is load balancing operation for the first time: if operation for the first time, the initial sliding factor is provided with module ii I is provided with slippage factor according to request cell load situation initial value; If not operation is for the first time upgraded slippage factor and module I V is set according to the cell load condition information of receiving before, the value of adaptive renewal slippage factor.Request sub-district judging module V judges whether the value of slippage factor this moment surpasses maximum: if surpass maximum, load method for reporting then of the present invention finishes; If do not surpass maximum, then ask cell load information to report request module VI and initiate the request of reporting, and the value of carrying slippage factor.Report cell update module VII and upgrade trigger condition, and prepare to initiate cell load information and report feedback message according to the value of the slippage factor of receiving.Load balancing module VIII carries out the load balancing operation according to load-balancing algorithm in the request sub-district.Request sub-district judging module IX judges whether this load balancing is finished: if load balancing is finished, load reporting mechanism then of the present invention finishes; If load balancing is interrupted or failure, then skip to judging module II, carry out the adjustment of slippage factor again, finish until reporting flow process.Finish module X and represent that load method for reporting of the present invention finishes.
For the influence of different mechanisms to the load balancing effect is described, table 1 has provided and has adopted the inventive method and other reporting mechanisms to carry out the result who occurs after the moving load equalization operation among the embodiment 1.
Table 1. embodiment 1 is based on the operating result of the different loads method for reporting appearance of Event triggered
Figure BDA0000047204740000041
Mechanism 1 is that the Operations, Administration and Maintenance physical arrangements that the 69 meeting add-on conference of third generation partner program wireless access network the 3rd working group proposes triggers threshold mechanism, and wherein high triggering threshold event A triggers thresholding Th A=70%, the low threshold event B that triggers triggers thresholding Th B=30%, satisfy high threshold event A of triggering or the low threshold event B trigger condition that triggers if report the sub-district, then feed back cell load information and report.As shown in table 1: sub-district b feedback cell load information is reported, and the request sub-district will select sub-district b as the Target cell transferring load in the mechanism 1.
Mechanism 2 is the enhancing mechanism that the 70 meeting of third generation partner program wireless access network the 3rd working group proposes, and wherein high triggering threshold event A triggers thresholding Th A=max (C 1+ delta1, Th Overload), the low threshold event B that triggers triggers thresholding Th B=max (C 1+ delta2, Th Overload), C wherein 1Disposable load (C in the table 1 for the request sub-district 1=10%), delta1, delta2 are respectively 10% and 30%, Th Overload=30%, then high triggering threshold event A triggers thresholding Th A=30%, the low threshold event B that triggers triggers thresholding Th B=40%, and if report that incident B trigger condition is satisfied in the sub-district but trigger event A not before, feedback message not then.As shown in table 1: owing to triggered incident A before all sub-districts, sub-district b and sub-district d feedback cell load information are reported, and the request sub-district will select sub-district d as the Target cell transferring load in the mechanism 2.
Slippage factor α=10% of preserving in the load information method for reporting based on Event triggered in the moving load equilibrium of the present invention, maximum α Max=55%, adjust step delta=10, constant offset amount delta=45%, reporting for the first time based on the load information of Event triggered in the moving load equilibrium of the present invention, load balancing is operating as:
The request sub-district is provided with slippage factor earlier:
This moment, load balancing number of operations n=1 disposed the initial sliding factor
Figure BDA0000047204740000051
At this moment α=α 0=5%＜α Max=55%, then ask sub-district a according to adjacent cell list, by the S1 interface between base station and the mobile management entity, initiate cell load information to sub-district b, c, d and report request, the value of wherein carrying slippage factor.
Then, report sub-district feedback cell load information and report, this moment, incident B triggered thresholding Th B=30%, incident A triggers thresholding Th A=Th Overload+ α=30%+5%=35%, as shown in table 1: sub-district b, c, d satisfy incident A or incident B trigger condition, owing to triggered incident A before all sub-districts, so sub-district b, c, d feed back cell load information respectively and report.
Then, the moving load equalization operation is carried out in the request sub-district, and is as shown in table 1: the request sub-district will select sub-district c and sub-district d as the Target cell transferring load.
At last, request cell detection moving load equalization operation is finished: load balancing number of operations n is changed to 1, reports flow process and finishes.
As can be seen from Table 1: under the heavy duty situation of adjacent sub-district, mechanism 1 is owing to can not be provided with the triggering thresholding according to self load condition, cause sub-district c and sub-district d that the part disposable load is arranged, but can't not report owing to reach the triggering thresholding, sub-district a can only select the higher sub-district b of load state as Target cell, and because sub-district a does not know when terminate load shifts, and will influence the load balancing effect.Mechanism 2 causes having only sub-district d to report load state owing to can not the triggering thresholding be set flexibly according to self overload conditions, owing to ask this moment a overload in sub-district serious, sub-district d can only be 45%-Th with admitting transferring load Overload=15%, only choose sub-district d still can influence the load balancing effect as Target cell.The inventive method is because according to request cell-overload situation, when overload is serious, obtain the load information of how adjacent sub-district as far as possible, and then proof load portfolio effect, sub-district c and sub-district d all report load information among the present invention, sub-district a will select sub-district c or sub-district d as Target cell, thus the effect of better proof load equilibrium.
Embodiment 2:
Present embodiment is applied under the light load condition of adjacent sub-district, adopt 8 sub-districts, two kinds of access technologies, sub-district e access technology RAT-A wherein, sub-district f, g, h, i, j, k, l access technology RAT-B, sub-district e is as the request sub-district, sub-district f, g, h, i, j, k, l be as reporting the sub-district, and be kept at as neighbor cell in the middle of the adjacent cell list of sub-district e.Present embodiment need carry out twice load balancing operation altogether, and wherein all cell loads of hypothesis remain unchanged in twice load balancing operation, and too high triggering threshold event A is not all triggered in all sub-districts in three kinds of mechanism.
For the influence of different mechanisms to the load balancing effect is described, table 2 has provided and has adopted the inventive method and other reporting mechanisms to carry out the result who occurs after the moving load equalization operation among the embodiment 2.
Mechanism 1 is that the Operations, Administration and Maintenance physical arrangements that the 69 meeting add-on conference of third generation partner program wireless access network the 3rd working group proposes triggers threshold mechanism, and present embodiment and embodiment 1 parameter configuration are consistent: the high threshold event A that triggers triggers thresholding Th A=70%, the low threshold event B that triggers triggers thresholding Th B=30%, satisfy high threshold event A of triggering or the low threshold event B trigger condition that triggers if report the sub-district, then feed back cell load information and report.In the load balancing operation for the first time, sub-district f, h, i, j, l feedback cell load condition information, because sub-district h disposable load ratio is the highest, the request sub-district will select sub-district h as the Target cell transferring load in the mechanism 1, but this moment sub-district e and sub-district h cover the edge does not exist the user who can be used for shifting, therefore load balancing failure for the first time; In the load balancing operation for the second time, sub-district f, h, i, j, l feedback sub-district cell load information are reported, and the request sub-district will select the high sub-district l of disposable load ratio second as the Target cell transferring load in the mechanism 1.
Table 2. embodiment 2 is based on the operating result of the different loads method for reporting appearance of Event triggered
Figure BDA0000047204740000061
Mechanism 2 is the enhancing mechanism that the 70 meeting of third generation partner program wireless access network the 3rd working group proposes, and present embodiment and embodiment 1 parameter setting are consistent: the mechanism 2 high threshold event A that trigger trigger thresholding Th A=30%, the low threshold event B that triggers triggers thresholding Th B=40%, and if reporting the sub-district satisfies and lowly trigger threshold event B trigger condition but do not trigger the high threshold event A that triggers before, then do not feed back cell load information and report.As shown in table 2: in the load balancing operation for the first time, because too high triggering threshold event A is not triggered in all sub-districts, therefore sub-district h, i, j, k, l feedback cell load information are reported, because sub-district h disposable load ratio is the highest, the request sub-district will select sub-district h as the Target cell transferring load in the mechanism 2, but this moment sub-district e and sub-district h cover the edge does not exist the user who can be used for shifting, therefore load balancing failure for the first time; In the load balancing operation for the second time, sub-district h, i, j, k, l feedback cell load information are reported, and the request sub-district will select the high sub-district l of disposable load ratio second as the Target cell transferring load in the mechanism 2.
Load information method for reporting parameter setting and embodiment 1 in the present embodiment based on Event triggered in the moving load equilibrium of the present invention is consistent: slippage factor α=10% of preservation, maximum α Max=55%, adjust step delta=10, constant offset amount delta=45%, the concrete steps of moving load equilibrium are among the present invention:
Load balancing begins for the first time:
The request sub-district is provided with slippage factor earlier:
This moment load balancing number of operations n=1, the initial value of configuration slippage factor α
Figure BDA0000047204740000071
At this moment α=α 0=5%＜α Max=55%, then ask sub-district e according to adjacent cell list, by the S1 interface between base station and the mobile management entity, initiate cell load information to sub-district f, g, h, i, j, k, l and report request, the value of wherein carrying slippage factor.
Then, report sub-district feedback cell load information and report, this moment, incident B triggered thresholding Th B=30%, incident A triggers thresholding Th A=Th Overload+ α=30%+5%=35%, as shown in table 2: in the load balancing operation for the first time, sub-district f, g, h, i, j, k, l satisfy incident A or incident B trigger condition, but owing to all do not trigger incident A before all sub-districts, so g, h, i, j, k, l feedback cell load information are reported.
Then, the moving load equalization operation is carried out in the request sub-district, and is as shown in table 2: the request sub-district will select the highest sub-district h of disposable load ratio as the Target cell transferring load.
At last, do not have the user who can be used for shifting because sub-district e and sub-district h cover the edge, the load balancing failure for the first time of request cell detection: load balancing number of operations n is changed to n=n+1, and slippage factor is reset in the request sub-district, and beginning is load balancing for the second time:
The request sub-district is provided with slippage factor earlier:
This moment, load balancing number of operations n=2 and satisfied
Figure BDA0000047204740000072
Then upgrade slippage factor α=max (the 5%+ Δ, delta)=max (15%, 45%)=45%, at this moment α=α 0=45%＜α Max=55%, sub-district e is according to adjacent cell list in request, by the S1 interface between base station and the mobile management entity, initiates cell load information to sub-district f, g, h, i, j, k, l and reports request, the value of wherein carrying slippage factor.
Then: report sub-district feedback cell load information and report, this moment, the low threshold event B that triggers triggered thresholding Th B=30%, the high threshold event A that triggers triggers thresholding Th A=Th Overload+ α=30%+45%=75%, as shown in table 2: in the load balancing operation second time, owing to all do not trigger too high triggering threshold event A before all sub-districts, so sub-district l and the report of sub-district h feedback cell load information.
Then, the moving load equalization operation is carried out in the request sub-district, and is as shown in table 2: the request sub-district will select the high sub-district l of disposable load ratio second as the Target cell transferring load.
At last, request cell detection load transfer is for the second time finished: load balancing number of operations n is changed to 1, reports flow process and finishes.
As can be seen from Table 2: under the light load condition of adjacent sub-district, owing to there is the sub-district of more disposable load, three kinds of mechanism can reach the purpose of identical load balancing, but because the inventive method can dynamically be adjusted slippage factor according to the load state information of reporting the sub-district: when disposable load is higher in the cell load feedback message, improve the value of slippage factor, possible feedback message is mutual for the second time in reduction, by raising the triggering thresholding of incident A trigger condition, make the report number of cells of coincident event A trigger condition tail off, the feedback number of times that load information is reported when therefore reporting for the second time reduces.
Fig. 2 has provided load balancing operation for the first time, reports the load information feedback number of times of sub-district and the contrast histogram of other machine-processed load informations feedback number of times in the load information method for reporting of the present invention.Abscissa is for reporting sub-district sequence number and total degree, and ordinate is the feedback number of times that cell load is reported message.
Fig. 3 has provided load balancing operation for the second time, reports the load information feedback number of times of sub-district and the contrast histogram of other machine-processed load informations feedback number of times in the load information method for reporting of the present invention.Abscissa is for reporting sub-district sequence number and total degree, and ordinate is the feedback number of times that cell load is reported message.
Provide twice load balancing operation in the accompanying drawing 2, reported the load information feedback total degree of sub-district and the contrast histogram of other machine-processed load informations feedback total degree in the load information method for reporting of the present invention.Abscissa is for reporting sub-district sequence number and total degree, and ordinate is the feedback number of times that cell load is reported message.
Block diagram in the accompanying drawing 2,3 and 4 has shown following feature:
One, 1 feed back number of times block diagram A for the first time with mechanism and feed back number of times block diagram B with the first time of mechanism 2 and compare, the feedback number of times block diagram C that the inventive method is fed back for the first time shows: three kinds of mechanism are fed back total degree for the first time and are remained basically stable.
Two, 1 feeding back number of times block diagram D for the second time with mechanism feeds back number of times block diagram E with the second time of mechanism 2 and compares, the feedback number of times block diagram F that the inventive method is fed back for the second time shows: owing to improved the value of slippage factor, feed back number of times for the second time and obviously reduce than mechanism 1,2.
Three, compare with twice feedback number of times block diagram H of 1 twice feedback of mechanism number of times block diagram G and mechanism 2, the feedback number of times block diagram I of twice feedback of the inventive method shows: twice feedback total degree of method of the present invention reduced 20% than mechanism 1,2, save the signaling consumption of feedback message in network, and do not influenced the operation of load balancing as can be seen from Table 2.
Compared with prior art, the present invention is based on the load information method for reporting of Event triggered, because by in triggering thresholding, introducing slippage factor, so that the Event triggered thresholding can dynamically be adjusted according to the load state information of request cell-overload situation and report residential quarter, thereby the performance of lifting mobile load balancing, and lower the signaling consumption that load report information interaction is brought in the network.

Claims (1)

  1. In the moving load equilibrium based on the load information method for reporting of Event triggered, comprise: each sub-district is provided with a base station in the mobile communication system of different access technologies, and the configuration height triggers threshold event A and the low trigger condition that triggers threshold event B in the load-balancing algorithm module of all base stations: when the sub-district is in overload conditions, this sub-district as the request sub-district, is initiated load according to neighbor cell lists by the sub-district of S1 interface in all tabulations and reported request; The sub-district of receiving the load request of reporting as reporting the sub-district, is reported to request sub-district feedback load information by the S1 interface;
    It is characterized in that:
    The low triggering thresholding Th that triggers threshold event B B=Th Overload, Th wherein OverloadBe overload threshold; The high triggering thresholding Th that triggers threshold event A A=Th Overload+ α, wherein α is a slippage factor;
    The request sub-district is provided with slippage factor earlier:
    If load balancing number of operations n=1, if request sub-district disposable load C 0Satisfy
    1 2 &times; Th overload < C 0 &le; Th overload
    The initial sliding factor then
    Figure FDA0000047204730000012
    Wherein α is the base station value of the slippage factor of preservation before, then current slippage factor α=α 0If request sub-district disposable load C 0Satisfy
    0 &le; C 0 &le; 1 2 &times; Th overload
    The initial sliding factor then
    Figure FDA0000047204730000014
    Wherein α is the base station value of the slippage factor of preservation before, then current slippage factor α=α 0
    If disposable load C in the report of cell load message is reported if the request sub-district receives in load balancing number of operations n ≠ 1 k, k ∈ 1,2 ..., maximum disposable load satisfies among the K}
    max k { C k } > Th overload + delta
    Wherein K is for reporting number of cells, and delta is the constant offset amount, and then slippage factor is updated to α=max (α-Δ, 0), and wherein Δ is the adjustment step-length of slippage factor α; If receiving, the request sub-district reports disposable load C in the cell load feedback message k, k ∈ 1,2 ..., maximum disposable load satisfies among the K}
    max k { C k } > Th overload + delta
    Then slippage factor be updated to α=max (α+Δ, delta);
    If slippage factor α 〉=α Max, α wherein MaxBe the slippage factor maximum, load balancing number of operations n is changed to 1, then reports flow process and finishes;
    If slippage factor α＜α Max, the value of slippage factor α is preserved in the base station, and the request sub-district is initiated load according to neighbor cell lists by the sub-district of S1 interface in all tabulations and is reported request, and the value of carrying slippage factor α in request message;
    Then, reporting sub-district feedback cell load information reports:
    Satisfy highly when triggering threshold event A trigger condition if report the sub-district, this sub-district comprises the grade of load indication of this sub-district and the cell load condition information of the up/ratio of descending disposable load in cell capacity by the S1 interface to request sub-district feedback;
    If report satisfied low triggering threshold event B trigger condition in sub-district and the high threshold event A that triggers when having triggered before, information is reported, the sign that shifts as interrupt load with load state 0 in this information by interface S1 to request sub-district feedback cell load in this sub-district;
    Satisfy and lowly trigger threshold event B trigger condition but do not trigger the high threshold event A that triggers before if report the sub-district, then feedback message not;
    Then, the moving load equalization operation is carried out in the request sub-district;
    At last, step is detected in the request sub-district:
    If the load balancing operation is finished, n is changed to 1 with the load balancing number of operations, reports flow process and finishes;
    If load balancing operation disruption or failure then are changed to n=n+1 with load balancing number of operations n, slippage factor is reset in the request sub-district, carries out new round operation.
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